scholarly journals Positive selection and intragenic recombination contribute to high allelic diversity in effector genes ofMycosphaerella fijiensis, causal agent of the black leaf streak disease of banana

2013 ◽  
Vol 15 (5) ◽  
pp. 447-460 ◽  
Author(s):  
Ioannis Stergiopoulos ◽  
Viviane Cordovez ◽  
Bilal Ökmen ◽  
Henriek G. Beenen ◽  
Gert H. J. Kema ◽  
...  
Keyword(s):  
Positive Selection ◽  
Allelic Diversity ◽  
Causal Agent ◽  
Intragenic Recombination ◽  
Effector Genes ◽  
High Allelic Diversity ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease

Construction of a genetic linkage map of the fungal pathogen of banana Mycosphaerella fijiensis, causal agent of black leaf streak disease

2008 ◽  
Vol 53 (5) ◽  
pp. 299-311 ◽  
Author(s):  
Gilberto Manzo-Sánchez ◽  
Marie-Françoise Zapater ◽  
Francisco Luna-Martínez ◽  
Laura Conde-Ferráez ◽  
Jean Carlier ◽  
...  
Keyword(s):  
Linkage Map ◽  
Fungal Pathogen ◽  
Genetic Linkage ◽  
Genetic Linkage Map ◽  
Causal Agent ◽  
Mycosphaerella Fijiensis ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease

Isolation and characterization of the mating type locus of Mycosphaerella fijiensis, the causal agent of black leaf streak disease of banana

2007 ◽  
Vol 8 (1) ◽  
pp. 111-120 ◽  
Author(s):  
LAURA CONDE-FERRÁEZ ◽  
CEES WAALWIJK ◽  
BLONDY B. CANTO-CANCHÉ ◽  
GERT H. J. KEMA ◽  
PEDRO W. CROUS ◽  
...  
Keyword(s):  
Mating Type ◽  
Causal Agent ◽  
Mycosphaerella Fijiensis ◽  
Type Locus ◽  
Mating Type Locus ◽  
Isolation And Characterization ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease

scholarly journals Unexpectedly High Allelic Diversity at the KIT Locus Causing Dominant White Color in the Domestic Pig

Genetics ◽  
2002 ◽  
Vol 160 (1) ◽  
pp. 305-311
Author(s):  
G Pielberg ◽  
C Olsson ◽  
A-C Syvänen ◽  
L Andersson
Keyword(s):  
Coat Color ◽  
Allelic Diversity ◽  
Growth Factor Receptor ◽  
Small Sample ◽  
Color Variation ◽  
Large White ◽  
High Genetic Diversity ◽  
High Allelic Diversity ◽  
Stem Cell Growth Factor ◽  
New Alleles

Abstract Mutations in KIT encoding the mast/stem cell growth factor receptor (MGF) are responsible for coat color variation in domestic pigs. The dominant white phenotype is caused by two mutations, a gene duplication and a splice mutation in one of the copies leading to skipping of exon 17. Here we applied minisequencing and pyrosequencing for quantitative analysis of the number of copies with the splice form. An unexpectedly high genetic diversity was revealed in white pigs. We found four different KIT alleles in a small sample of eight Large White females used as founder animals in a wild boar intercross. A similar number of KIT alleles was found in commercial populations of white Landrace and Large White pigs. We provide evidence for at least two new KIT alleles in pigs, both with a triplication of the gene. The results imply that KIT alleles with the duplication are genetically unstable and new alleles are most likely generated by unequal crossing over. This study provides an improved method for genotyping the complicated Dominant white/KIT locus in pigs. The results also suggest that some alleles may be associated with negative pleiotropic effects on other traits.

scholarly journals Cox Processes Associated with Spatial Copula Observed through Stratified Sampling

Mathematics ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 524
Author(s):  
Walguen Oscar ◽  
Jean Vaillant
Keyword(s):  
Environmental Effects ◽  
Gaussian Copula ◽  
Spatial Dependency ◽  
Spatial Effects ◽  
Doubly Stochastic ◽  
Cox Processes ◽  
Black Leaf Streak ◽  
Spatial Random Field ◽  
Black Leaf Streak Disease ◽  
Spatial Count Data

Cox processes, also called doubly stochastic Poisson processes, are used for describing phenomena for which overdispersion exists, as well as Poisson properties conditional on environmental effects. In this paper, we consider situations where spatial count data are not available for the whole study area but only for sampling units within identified strata. Moreover, we introduce a model of spatial dependency for environmental effects based on a Gaussian copula and gamma-distributed margins. The strength of dependency between spatial effects is related with the distance between stratum centers. Sampling properties are presented taking into account the spatial random field of covariates. Likelihood and Bayesian inference approaches are proposed to estimate the effect parameters and the covariate link function parameters. These techniques are illustrated using Black Leaf Streak Disease (BLSD) data collected in Martinique island.

scholarly journals Sequence Diversity and Molecular Evolution of the Leukotoxin (lktA) Gene in Bovine and Ovine Strains ofMannheimia (Pasteurella)haemolytica

2001 ◽  
Vol 183 (4) ◽  
pp. 1394-1404 ◽  
Author(s):  
Robert L. Davies ◽  
Thomas S. Whittam ◽  
Robert K. Selander
Keyword(s):  
Molecular Evolution ◽  
Allelic Diversity ◽  
Pasteurella Haemolytica ◽  
Intragenic Recombination ◽  
Allelic Variants ◽  
Amino Acid Divergence ◽  
History Of ◽  
Nucleotide Divergence ◽  
Pasteurella Trehalosi ◽  
Different Sources

ABSTRACT The molecular evolution of the leukotoxin structural gene (lktA) of Mannheimia (Pasteurella)haemolytica was investigated by nucleotide sequence comparison of lktA in 31 bovine and ovine strains representing the various evolutionary lineages and serotypes of the species. Eight major allelic variants (1.4 to 15.7% nucleotide divergence) were identified; these have mosaic structures of varying degrees of complexity reflecting a history of horizontal gene transfer and extensive intragenic recombination. The presence of identical alleles in strains of different genetic backgrounds suggests that assortative (entire gene) recombination has also contributed to strain diversification in M. haemolytica. Five allelic variants occur only in ovine strains and consist of recombinant segments derived from as many as four different sources. Four of these alleles consist of DNA (52.8 to 96.7%) derived from the lktA gene of the two related species Mannheimia glucosida andPasteurella trehalosi, and four contain recombinant segments derived from an allele that is associated exclusively with bovine or bovine-like serotype A2 strains. The two major lineages of ovine serotype A2 strains possess lktA alleles that have very different evolutionary histories and encode divergent leukotoxins (5.3% amino acid divergence), but both contain segments derived from the bovine allele. Homologous segments of donor and recipient alleles are identical or nearly identical, indicating that the recombination events are relatively recent and probably postdate the domestication of cattle and sheep. Our findings suggest that host switching of bovine strains from cattle to sheep, together with inter- and intraspecies recombinational exchanges, has played an important role in generating leukotoxin diversity in ovine strains. In contrast, there is limited allelic diversity of lktA in bovine strains, suggesting that transmission of strains from sheep to cattle has been less important in leukotoxin evolution.

scholarly journals Varietal Differences in the Volatile Profile of Bananas with Resistance to Black Leaf Streak Disease

2014 ◽  
pp. 597-600
Author(s):  
Maria Flávia A. Penha ◽  
Victor C. Castro Alves ◽  
Náyra O.F. Pinto ◽  
Hilton Cesar R. Magalhães ◽  
Francisco J.B. Reifschneider ◽  
...  
Keyword(s):  
Volatile Profile ◽  
Varietal Differences ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease

EFFECT OF BLACK LEAF STREAK DISEASE ON BANANA FRUIT QUALITY

2013 ◽  
pp. 339-343
Author(s):  
L.A. Saraiva ◽  
F.P. Castelan ◽  
B.R. Cordenunsi ◽  
M. Chillet
Keyword(s):  
Fruit Quality ◽  
Banana Fruit ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease
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